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Industrial frequency inductance-regulation resonance pressure-resistant method

A power frequency withstand voltage and resonance technology, applied in the direction of testing dielectric strength, etc., can solve the problems of high price, single function, bulky device, etc., and achieve the effect of reliable performance, intuitive display, and small size

Inactive Publication Date: 2012-07-18
CHINA FIRST METALLURGICAL GROUP
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Problems solved by technology

[0003] ① Traditional compensation transformer power supply (ACTC) method: This method has a single function and cannot meet the AC withstand voltage test of various high-voltage equipment, especially power cables at the same time
[0004] ②Large frequency adjustable resonant power source (ACRL) method: This method is currently only used in system tests above 35kV, and the device is bulky and cumbersome
[0005] ③ Frequency conversion resonant power supply (ACRF) method: The test voltage provided by this method cannot correctly reflect the power frequency working environment of high-voltage equipment, and the performance of the device is unreliable and expensive

Method used

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  • Industrial frequency inductance-regulation resonance pressure-resistant method
  • Industrial frequency inductance-regulation resonance pressure-resistant method
  • Industrial frequency inductance-regulation resonance pressure-resistant method

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Embodiment Construction

[0030] The principle of the industrial frequency tuned induction resonance voltage withstand method provided by the present invention is based on:

[0031] According to the formula X L = 2πfL X C =1 / 2π fC when X L =X C When the series resonance, that is:

[0032] Formula 1

[0033] The line current depends on the test voltage and loop capacitance, namely:

[0034] I=ωC X u 试 = 2πfC X u 试 Formula 2

[0035] The power-frequency induction resonance voltage withstand method provided by the present invention specifically adopts a method comprising the following steps:

[0036] 1. Preparatory work: Combine test equipment according to the test content. The test equipment includes test transformer voltage regulation control device, excitation transformer, fixed reactor, fine-tuning reactor, compensation capacitor, and capacitive voltage divider.

[0037] (1) if figure 1 and figure 2 As shown: the output terminal of the test transformer voltage regulation control de...

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Abstract

The invention relates to a power frequency slide resonance withstand voltage method for combining a testing device according to test contents. The testing device comprises a testing transformer voltage regulating control device, an exciting transformer, a fixed reactor, a fine control reactor, a compensating capacitor and a capacitive voltage divider. The method comprises the following steps: adopting the connecting mode and the parameter configuration of the corresponding fixed reactor and the fine control reactor according to the capacitance of a 35 kV and above high-voltage device under test in the electrical installation engineering of the metallurgical industry; selecting the connecting mode and the parameter configuration of the compensating capacitor according to the capacitance and the configuration of the device under test; utilizing the resonance principle to finely control the fine control reactor, so that a test loop achieves the resonance condition and the output voltage achieves the maximum value; and resulting in the minimal capacitance demands on the testing device in the resonance condition when the purpose of withstand voltage test is achieved. The method can simultaneously satisfy the alternating current withstand voltage test of various high-voltage devices, in particular to power cables, serves the protection functions of over current and over voltage, andis suitable for power frequency withstand voltage hand-over test.

Description

technical field [0001] The invention relates to the field of handover test of electrical equipment, in particular to a power frequency tuned sense resonance resonance withstand voltage method. Background technique [0002] According to the provisions of the national standard GB50150-2006 "Electrical Equipment Handover Test Standard" Article 18.0.5 on the AC withstand voltage test of power cables: 20-300Hz AC withstand voltage test is preferred for rubber and plastic cables; the rated voltage U0 / U is 18 / 30kV The above cables shall adopt AC withstand voltage. The existing AC test power supply can be divided into the following three types: [0003] ① Traditional compensation transformer power supply (ACTC) method: This method has a single function and cannot simultaneously meet the AC withstand voltage test of various high-voltage equipment, especially power cables. [0004] ②Large frequency adjustable resonant power source (ACRL) method: This method is currently only used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 程柏超李和平李德家
Owner CHINA FIRST METALLURGICAL GROUP
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